1 Algae eater casualty

Yep today I found 1 AE dead.. He was fresh but o wont speculate too much on causes, However I added Peat moss and it locked the PH down from 9.5 ish to 7.3 ish in a matter of hours and the other AE's seem to be doing well. The colour is there and im seeing a bit of interactive behavior.. They seem to hang around each other.. so far so good we will see in the next few days..